Rotary machine



April 29, 1941. Q SQRGE 2,240,465

ROTARY MACHINE Filed June 12, l939 Patented Apr. y29, 1941 yUNITED STATES PATENT OFFICE ROTARY MACHINE Otto Sorge, Berlin, Germany Application .Tune 12, 1939, serial No. 278,716 In Germany May 4, 1938 (Cl. ID3-136) 4 Claims.

This invention relates to an improved rotary machine to be used chieily as vacuum pump, as well as compressor. I am aware of the existence of pumps of the type, in which radially movable blades are arranged in radial slots of a rotor arranged eccentrically in a stationary casing, The advantages obtainable by such machines are the greater the greater the number of revolutions of the same is, in that the specific output of the machine is correspondingly increased, but there increases also the centrifugal force to which the blades are subjected, this increase being far from being desired, in that it increases in the square of the number of revolutions. The frictional resistance between the blades and the inner circumferential wall of the casing is likewise increased, as is also, as a consequence thereof, the heating and, nally, also the consumption of power. It is, anyhow, possible, to overcome the undesired consequences mentioned by the provision of balance weights arranged counter to the blades, i. e. on the other side of the axis of the machine,land to connect the blades and said weights with one another, the purpose of these latter being to counterbalance the centrifugal force.

The various constructional forms of rotary machines of the above-mentioned type which have become known up to now suier all especially from the two serious drawbacks that they are very expensive and operate uneconomically. It is, with said machines, inuispensably requisite that the blades must be guided in the slots veryaccurately, which is true also of the guiding of the balance weights in said slots, and that accurate` guiding requires excellent workmanship which renders the manufacture correspondingly expensive and necessitates, of course, also correspondingly much time, apart from 4the fact that the result is never completely satisfying', also as regards the output and the efliciency.

.The above-mentioned drawbacks have new all been overcome by the present improved design which renders it, in fact, possible to attain double the efficiency by simplified means which do not require such very great care as regards the guidance of the blades and o the balance weight. This improved machine is illustrated diagrammatically and by way of example lon the accompanying drawing on which Figure 1 is a transverse vertical section through the constructional form shown. Figure 2 is an axial section of that machine, the casing being omitted, and the figure being drawn to a slightly enlarged scale relatively to Fig. 1, and Figure 3 is a view similar to Fig. 2 and shows a slightly modified constructional form of the machine.

On the drawing, d denotes the stationary casing which is provided with the branches dl and d2 for sucking in the' medium to be dealt with and for discharging it. Within said casing is eccentrically arranged the rotor which consists in this example of the halves el and e2 which are connected with one another by frontal disks f to which are affixed trunnion g, by the intermediary of which the rotor is rotated. The rotor halves el e2 are not accurate halves in that there is left between them a diametrically ex-4 tending slot in which are located the blades aal and the balance weights bbl. These weights are arranged inside o'f the blades, and they are provided lwith radial bores through which extend rods c and `cl by which the weights and the blades are connected with one another in such a manner that each blade is connected with that weight which lies adjacent to the oppositely located blade, -as appears particularly distinctly from Fig. 1. The rods pertaining to any one of the blades alternate with the rods pertainingto the other blade, as appears likewise particularly distinctly from Fig. 2. The rods serve as guide members for the weights, and this being so it is no more necessaryto provide recesses in the blades in order to guide the weights, as has been necessary in the constructional forms vhaving become known up to now. Another advantage of this new construction is that the weights can be given a size rendering it actually possible to balance the action of the centrifugal force upon the blades which is highly favorable for the eiciency of the machine. Owing to the avoidance of recesses in the blades, as mentioned, the manui facture of them is greatly simplified and the manufacturing vcosts are greatly reduced, and as the dimensions of the machine can. be reduced without any reduction of the output, a corresponding y amount of the high-grade material requisite for the machine is saved which entails further saw ings as regards the manufactured costs.

In the constructional forms shown by way of example there are two blades, but it is a matter of course that, for instance, also four blades mayl side of the rotor and having uniform transverse section throughout its entire length. This is true also of the balance weights, but as regards these latter, I wishv it to be understood that instead of a continuous weight, such as b or bl, a plurality of smaller weights arranged in a series may be used. as is indicated in Fig. 3 in which b2 indicates the row of such smaller weights.

If the machine is provided with four blades, of course in connection with a corresponding number lof balance weights, the advantages obtainable by the machine will be still greater in' every respect. y

I claim':

1. A rotary machine, comprising, in combination, a. stationary casing, a rotor arranged eccentrically in said casing and provided with a slot extending diametrically through it, blades arranged in said slot in the end portions thereof and contacting at their outermost faces with the inner circumferential surface o1' said casing,'bal ance weights likewise arranged in said slot near to the innermost faces of said blades and provided with radial bores. rods amxed to the said blades atthe innermost faces of the same and extending through the bores of the adjacent balance weights and being ilrmly connected at the other end with the there located balance weight.

2. A rotary machine as speciiled in claim 1, in which the connecting rods extending from any of the blades to the oppositely located balance weight constitute guide members forthe balance weight, through the bores of which they extend.

3. A rotary machine as specified in claim 1, in which the connecting rods extending from one of the blades to the oppositely located balance weight and from theother blade to the oppositely located balance weight alternate with one another.

4. A rotary machine as specified in claim 1, in which each balance weightconsists of a plurality of parts of equall transverse section arranged side by side parallel to the longitudinal axis of the machine.

OTTQ SORGE. 

